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176
cristy307ba182010-12-25 01:00:34 +0000[diff] [blame]177<h1>Module signature
178 Methods</h1>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]179<p class="navigation-index">[<a href="#SignatureImage">SignatureImage</a>]</p>
180
181<h2><a href="http://www.imagemagick.org/api/MagickCore/signature
182_8c.html" target="source" name="SignatureImage">SignatureImage</a></h2>
183<div class="doc-section">
184
185<p>SignatureImage() computes a message digest from an image pixel stream with an implementation of the NIST SHA-256 Message Digest algorithm. This signature uniquely identifies the image and is convenient for determining if an image has been modified or whether two images are identical.</p></ol>
186
187<p>The format of the SignatureImage method is:</p>
188
189<pre class="code">
190 MagickBooleanType SignatureImage(Image *image)
191</pre>
192
193<p>A description of each parameter follows:</p></ol>
194
195<h5>image</h5>
196<ol><p>the image.</p></ol>
197
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